src/game/java/net/minecraft/client/model/BookModel.java

package net.minecraft.client.model;

import net.minecraft.client.model.geom.ModelPart;
import net.minecraft.client.model.geom.PartPose;
import net.minecraft.client.model.geom.builders.CubeListBuilder;
import net.minecraft.client.model.geom.builders.LayerDefinition;
import net.minecraft.client.model.geom.builders.MeshDefinition;
import net.minecraft.client.model.geom.builders.PartDefinition;
import net.minecraft.client.renderer.RenderType;
import net.minecraft.util.Mth;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class BookModel extends Model {
    private static final String LEFT_PAGES = "left_pages";
    private static final String RIGHT_PAGES = "right_pages";
    private static final String FLIP_PAGE_1 = "flip_page1";
    private static final String FLIP_PAGE_2 = "flip_page2";
    private final ModelPart leftLid;
    private final ModelPart rightLid;
    private final ModelPart leftPages;
    private final ModelPart rightPages;
    private final ModelPart flipPage1;
    private final ModelPart flipPage2;

    public BookModel(ModelPart p_170475_) {
        super(p_170475_, RenderType::entitySolid);
        this.leftLid = p_170475_.getChild("left_lid");
        this.rightLid = p_170475_.getChild("right_lid");
        this.leftPages = p_170475_.getChild("left_pages");
        this.rightPages = p_170475_.getChild("right_pages");
        this.flipPage1 = p_170475_.getChild("flip_page1");
        this.flipPage2 = p_170475_.getChild("flip_page2");
    }

    public static LayerDefinition createBodyLayer() {
        MeshDefinition meshdefinition = new MeshDefinition();
        PartDefinition partdefinition = meshdefinition.getRoot();
        partdefinition.addOrReplaceChild(
            "left_lid",
            CubeListBuilder.create().texOffs(0, 0).addBox(-6.0F, -5.0F, -0.005F, 6.0F, 10.0F, 0.005F),
            PartPose.offset(0.0F, 0.0F, -1.0F)
        );
        partdefinition.addOrReplaceChild(
            "right_lid",
            CubeListBuilder.create().texOffs(16, 0).addBox(0.0F, -5.0F, -0.005F, 6.0F, 10.0F, 0.005F),
            PartPose.offset(0.0F, 0.0F, 1.0F)
        );
        partdefinition.addOrReplaceChild(
            "seam",
            CubeListBuilder.create().texOffs(12, 0).addBox(-1.0F, -5.0F, 0.0F, 2.0F, 10.0F, 0.005F),
            PartPose.rotation(0.0F, (float) (Math.PI / 2), 0.0F)
        );
        partdefinition.addOrReplaceChild(
            "left_pages", CubeListBuilder.create().texOffs(0, 10).addBox(0.0F, -4.0F, -0.99F, 5.0F, 8.0F, 1.0F), PartPose.ZERO
        );
        partdefinition.addOrReplaceChild(
            "right_pages", CubeListBuilder.create().texOffs(12, 10).addBox(0.0F, -4.0F, -0.01F, 5.0F, 8.0F, 1.0F), PartPose.ZERO
        );
        CubeListBuilder cubelistbuilder = CubeListBuilder.create().texOffs(24, 10).addBox(0.0F, -4.0F, 0.0F, 5.0F, 8.0F, 0.005F);
        partdefinition.addOrReplaceChild("flip_page1", cubelistbuilder, PartPose.ZERO);
        partdefinition.addOrReplaceChild("flip_page2", cubelistbuilder, PartPose.ZERO);
        return LayerDefinition.create(meshdefinition, 64, 32);
    }

    public void setupAnim(float p_102293_, float p_102294_, float p_102295_, float p_102296_) {
        float f = (Mth.sin(p_102293_ * 0.02F) * 0.1F + 1.25F) * p_102296_;
        this.leftLid.yRot = (float) Math.PI + f;
        this.rightLid.yRot = -f;
        this.leftPages.yRot = f;
        this.rightPages.yRot = -f;
        this.flipPage1.yRot = f - f * 2.0F * p_102294_;
        this.flipPage2.yRot = f - f * 2.0F * p_102295_;
        this.leftPages.x = Mth.sin(f);
        this.rightPages.x = Mth.sin(f);
        this.flipPage1.x = Mth.sin(f);
        this.flipPage2.x = Mth.sin(f);
    }
}